Add display scaling and rotation shortcuts to keyboard overlay.

chrome/browser/resources/chromeos/keyboard_overlay.js

Index: chrome/browser/resources/chromeos/keyboard_overlay.js
diff --git a/chrome/browser/resources/chromeos/keyboard_overlay.js b/chrome/browser/resources/chromeos/keyboard_overlay.js
index 4d68ac1b44acac56fb6b4882024817151f9ffecf..80be8e386cf45ef613ff0dc4ba0beb3ffd695f6b 100644
--- a/chrome/browser/resources/chromeos/keyboard_overlay.js
+++ b/chrome/browser/resources/chromeos/keyboard_overlay.js
@@ -128,6 +128,17 @@ function getShortcutData() {
 
   shortcutDataCache = keyboardOverlayData['shortcut'];
 
+  if (!isDisplayRotationEnabled()) {
+    // Rotate screen
+    delete shortcutDataCache['reload<>CTRL<>SHIFT'];
+  }
+  if (!isDisplayUIScalingEnabled()) {
+    // Scale up UI
+    delete shortcutDataCache['back<>CTRL<>SHIFT'];
+    // Scale down UI
+    delete shortcutDataCache['forward<>CTRL<>SHIFT'];
+  }
+
   // TODO(mazda): Clean this up and move these out to the data js.
   var searchModifierAddShortcuts = {
     '1<>SEARCH': 'keyboardOverlayF1',
@@ -608,6 +619,24 @@ function hasDiamondKey() {
 }
 
 /**
+ * Returns true if display rotation feature is enabled.
+ * @return {boolean} True if display rotation feature is enabled.
+ */
+function isDisplayRotationEnabled() {
+  return (loadTimeData.getString('keyboardOverlayIsDisplayRotationEnabled') ==
+          'true');
+}
+
+/**
+ * Returns true if display scaling feature is enabled.
+ * @return {boolean} True if display scaling feature is enabled.
+ */
+function isDisplayUIScalingEnabled() {
+  return (loadTimeData.getString('keyboardOverlayIsDisplayUIScalingEnabled') ==
+          'true');
+}
+
+/**
  * Initializes the layout and the key labels for the keyboard that has a diamond
  * key.
  */